The US dollar's dominance is less about its role in oil transactions (petrodollar) and more about its deep integration into global banking and financial plumbing via the Eurodollar system. This structural entrenchment makes it incredibly difficult to displace.

By establishing the dollar as the world's reserve currency after WWII, the U.S. gained the unique power to run huge debts and print money. This effectively forced other countries holding and trading dollars to absorb the inflationary costs of U.S. spending, funding the 'American dream' at global expense.

The vast majority of global trade is funded by US dollars that exist outside the US, known as Eurodollars. This system operates beyond the Fed's direct control and relies entirely on trust. Money is created when banks extend credit and destroyed when they don't, making the global economy inherently fragile.

The US dollar reached its peak global dominance in the early 2000s. The world is now gradually shifting to a system where multiple currencies (like the euro and yuan) and neutral assets (like gold) share the role of reserve currency, marking a return to a more historically normal state.

Contrary to the de-dollarization narrative, the rise of dollar-pegged stablecoins is poised to increase the dollar's global hegemony. They provide new, efficient digital rails for international transactions, reinforcing the dollar's role as the world's primary settlement currency in the digital age.

The U.S. maintains global financial dominance less through military might and more through the Federal Reserve's currency swap lines. These agreements backstop the vast pool of dollars created by foreign banks, making the Fed the indispensable lender of last resort for the entire global system.

Beyond cultural exports, one of America's most significant global contributions is its system of federally insured bank deposits. The FDIC, born from repeated banking crises, created an unparalleled level of financial stability and trust that underpins the dollar's global power.

The US is embracing stablecoins to maintain the dollar's global dominance. By enabling easy access to digital dollars worldwide, it creates new, decentralized demand for US treasuries to back these stablecoins, offsetting reduced purchasing from foreign central banks.

A nation’s currency becomes dominant long after its economic and military power is established. Similarly, it retains that status due to network effects long after other metrics of power have begun to decline. The dollar's persistence is an example of this lagging effect.